THRILS -- The High-(Redshift+Ionization) Line Search: Program Description & Redshift Catalog
Abstract
To date, many spectroscopic confirmations of z>7 galaxies have been obtained using JWST/NIRSpec prism observations, with most of their physical properties inferred from these observations and corresponding imaging. What is needed are higher-resolution spectra at deeper depths to study these sources in detail. We present The High-(Redshift+Ionization) Line Search (THRILS) program: deep (>8 hr) observations in two pointings of JWST/NIRSpec G395M spectroscopy to 1) probe high ionization spectral features in z>8 galaxies that are indicative of top-heavy initial mass functions or growing massive black holes, 2) search for accreting supermassive black holes in typical galaxies at z~4-9 through broad Balmer line emission, and 3) probe the stellar-mass growth histories of massive galaxies. We include spectroscopic redshift measurements for 89 sources from the THRILS data, as well as a detection threshold for the full and half depth integration times of the program.
Cite
@article{arxiv.2512.12509,
title = {THRILS -- The High-(Redshift+Ionization) Line Search: Program Description & Redshift Catalog},
author = {Taylor A. Hutchison and Rebecca L. Larson and Pablo Arrabal Haro and Erini Lambrides and Katherine Chworowsky and Gourav Khullar and Kelcey Davis and Steven L. Finkelstein and Jane R. Rigby and Guillermo Barro and Nikko J. Cleri and Dale Kocevski and Jacqueline Antwi-Danso and Mic Bagley and Danielle A. Berg and Volker Bromm and Oscar Chavez Ortiz and John Chisholm and Sadie C. Coffin and M. C. Cooper and Olivia Cooper and Isa G. Cox and Mark Dickinson and Harry Ferguson and Maximilien Franco and Jonathan P. Gardner and Ananya Ganapathy and Norman Grogin and Michaela Hirschmann and Marc Huertas-Company and Intae Jung and Jeyhan S. Kartaltepe and Anton M. Koekemoer and Ray A. Lucas and Elizabeth McGrath and Alexa M. Morales and Grace M. Olivier and Casey Papovich and Pablo G. Perez-Gonzalez and Nor Pirzkal and Rachel S. Somerville and Anthony J. Taylor and Jonathan R. Trump and Brittany Vanderhoof and Benjamin Weiner and Brian Welch and L. Y. Aaron Yung and Jorge A. Zavala and the THRILS collaboration},
journal= {arXiv preprint arXiv:2512.12509},
year = {2025}
}
Comments
27 pages, 6 figures, 4 tables; submitted to ApJ